Replace DnDns with HeijdenDns

HeijdenDns seems to do a better job at querying SRV records

MinecraftClient/Protocol/Dns/Records/RecordAFSDB.cs

@@ -0,0 +1,52 @@
+using System;
+/* http://tools.ietf.org/rfc/rfc1183.txt
+
+ * 1. AFS Data Base location
+
+   This section defines an extension of the DNS to locate servers both
+   for AFS (AFS is a registered trademark of Transarc Corporation) and
+   for the Open Software Foundation's (OSF) Distributed Computing
+   Environment (DCE) authenticated naming system using HP/Apollo's NCA,
+   both to be components of the OSF DCE.  The discussion assumes that
+   the reader is familiar with AFS [5] and NCA [6].
+
+   The AFS (originally the Andrew File System) system uses the DNS to
+   map from a domain name to the name of an AFS cell database server.
+   The DCE Naming service uses the DNS for a similar function: mapping
+   from the domain name of a cell to authenticated name servers for that
+   cell.  The method uses a new RR type with mnemonic AFSDB and type
+   code of 18 (decimal).
+
+   AFSDB has the following format:
+
+   <owner> <ttl> <class> AFSDB <subtype> <hostname>
+
+   Both RDATA fields are required in all AFSDB RRs.  The <subtype> field
+   is a 16 bit integer.  The <hostname> field is a domain name of a host
+   that has a server for the cell named by the owner name of the RR.
+
+ */
+
+namespace Heijden.DNS
+{
+	public class RecordAFSDB : Record
+	{
+		public ushort SUBTYPE;
+		public string HOSTNAME;
+
+		public RecordAFSDB(RecordReader rr)
+		{
+			SUBTYPE = rr.ReadUInt16();
+			//HOSTNAME = rr.ReadString();
+			HOSTNAME = rr.ReadDomainName();
+		}
+
+		public override string ToString()
+		{
+			return string.Format("{0} {1}",
+				SUBTYPE,
+				HOSTNAME);
+		}
+
+	}
+}